Update status for Firefox 50

tests/corelib/corelib.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) ]
 bool_from_environment2_test: Skip
 bool_from_environment_test: Skip
 from_environment_const_type_test: Skip
 from_environment_const_type_undefined_test: Skip
 int_from_environment2_test: Skip
@@ skipping 63 matching lines @@
 # IEEE-754 rounding algorithm.
 double_parse_test/02: Fail, OK
 
 [ $runtime == safari || $runtime == safarimobilesim ]
 double_round3_test: Fail, OK # Runtime rounds 0.49999999999999994 to 1.
 double_round_to_double2_test: Fail, OK # Runtime rounds 0.49999999999999994 to 1.
 
 [ $runtime == ff ]
 double_round3_test: Pass, Fail, OK # Fails on ff 34, passes on ff 35. Runtime rounds 0.49999999999999994 to 1.
 double_round_to_double2_test: Pass, Fail, OK # Fails on ff 34, passes on ff 35. Runtime rounds 0.49999999999999994 to 1.
+list_test/none: RuntimeError # Issue 27871
+list_test/01: RuntimeError # Issue 27871
 
 [ $runtime == opera ]
 core_runtime_types_test: Fail
 null_nosuchmethod_test: Fail # Issue: 7413
 unicode_test: Fail # Issue 14694
 
 [ $compiler == dart2js ]
 error_stack_trace1_test: RuntimeError # Issue 12399
 hash_set_test/01: RuntimeError # Issue 11551
 integer_to_string_test/01: RuntimeError # Issue 1533
@@ skipping 110 matching lines @@
 package_resource_test: Skip # Resolve URI not supported yet in product mode.
 file_resource_test: Skip # Resolve URI not supported yet in product mode.
 http_resource_test: Skip # Resolve URI not supported yet in product mode.
 
 [ $arch == simdbc || $arch == simdbc64 ]
 regexp/stack-overflow_test: RuntimeError, OK # Smaller limit with irregex interpreter
 
 [ $hot_reload || $hot_reload_rollback ]
 big_integer_parsed_mul_div_vm_test: Pass, Slow # Slow.